I have noticed when conducting raids in a "camped" setting that there are invisible ogres attacking my troops. said ogres can be killed but you have to notice where your troops are randomly dieing to kill it. I know its an ogre because it makes those noises when it rapes my marauders.

I'm sorry, it was a year ago when I had it. All I remember is ranged units being unable to hit it, melee units being able to, no shadows or further effect from the attacks and ogre bodies dropping off, which were lootable. Thus the bug lasts while it's alive.

I do think it was on the quest when you pass by different orc villages and ambushes happen. I might be messing up though.

For me the steps were ...
0. Buy game via Steam
1. After fiddling with humies and elves, start the Orc campaign in Swamp
2. build a fair number of huts early on, build units, and go raiding a bit to level up units
3. Play the campaign missions until Honor to the Victor shows up
4. Having brought too large an army including siege stuff, enter mission (not taking all units)
Not sure if any of these steps are required.

That's odd, I've played that quest dozens of times (and again just now) and the Ogres are always visible.

If it's happening elsewhere, that suggests it's possibly due to missing/corrupt Ogre model/animation files. Since I can't replicate the problem you are having, I deleted my Ogre model/animation files and that did indeed make them invisible.

it comes and goes. I had the ogres from the orc quests turn invisible after a CTD, tried restart,etc, stayed invisible. After I logged back into my human town then back a week later I culd see em again. Also had it occur randomly in orc lands while viewing map.